2005 Mustang Rough Idle

noise, and to determine if the noise occurs at idle or above idle speed, and if the engine is cold, hot,3. I changed the throttle body on my 2005 Mustang GT to a BBK twin throttle body. It is because rough idle when warm can either be caused by one faulty component or through series of problems. Diagnosing the cause of the misfire (rough idle) on a 2. Re: 2005 Type-S rough idle + hesitation under load Well, this being my first experience with non-routine work at a dealer I had a bit of a moan to them this morning. When at idle, it seems like as if the car wants to die. It doesn't help that it idles so low (about 580 rpms seems about average). Attempt to duplicate the noise, and vehicle, if available, with an ENGINE build date determine the source of the symptom. I have owned my 2001 XC for almost 5 years now ( 149,000 mi) and have had a rough idle problem with this vehicle since the beginning, no matter what type of service that I perform. 2005 Lincoln Aviator. Some are related to intake manifold, some are to the vacuum line system, most the one connected to the PCV Valve. Car still starts and idles rough until I rev the RPM's up high. Take 5-liter Mustangs. Then you have full access to the right bank. it has the 6. I've always thought that by simply raising the idle speed about 100 rpms would help a lot. CPU must relearn and calibrate after battery disconnect. Hey guys I've recently been having some problems with the idling on my 2005 Mustang GT. If your car has over 100,000 miles and still has the original oxygen sensors, it wouldn't be a bad idea to replace them as part of a good tune-up. 4MPG HYW was on my last 154mile trip. Top 10 Causes of a Rough Idle | JL Motorworks. once the turbo catches up the power comes back. com Car Chat > Ford > Mustang > Mustang Problem Diagnosis. When an Idle Air Control Motor starts to fail, it can cause a rough idle, maintenance light, this will decrease the fuel mileage. My cousin has an 05 v6 mustang that randomly the idle will jump up to 1500 rpm. Diagnosing the cause of the misfire (rough idle) on a 2. i just rebuilt the carb, but that didn't help. I have a 2005 mustang gt mods to the car are predator diablo sport tuner c and l cold air intake and borla exhaust with off-road x pipe I purchased the car a month ago and with the ac on the car has stalled when coming to a stop after pushing the clutch in the idles will drop low come up then stall doesnt happen every time but still happens. 2005 Ford Mustang idle issues - Throttle. I've adjusted the idle mixture multiple times using a vacuum gauge and the results are always the same. which might cause the rough idle. This valve is comonly called the idle motor, the IAC (idle air control) or the IAB (Idle air bypass). Page 1 of 2 1 2 Next >. Since then she is running rich (from 750km/tank down to 500) and when pulling up to the lights after slipping it in neutral runs rough with idle fluctuating from 250-1000rpm. 73 gears, 2000+ stall, computer upgrade recommended. Oil is the life-blood of an engine, which means the oil filter should never be taken for granted, especially in harsh heavy-duty environments. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. Out of the blue one day the car acted like it was running on 5 cylinders when under acceleration or when cold at idle. 3L Ranger or Mustang is a diagnostic plan. Rough or erratic idle speed P0506 FORD Meaning The Engine Control Module ( ECM ) controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuator. 2005 Lincoln Aviator. but it wasnt turning on and off for awhile and then ive noticed in the past 2 weeks it had a really rough idle which it had before the evap went out. Today you can still net yourself a decent one for under $5,000, but chances are it needs some help. Check prices & reviews on aftermarket & stock parts for your 1994 Ranger Throttle Position Sensor. I am guessing rubber motor mount bushings are stiff when cold and soften by heat under the hood. When an IAC motor starts to malfunction, it can cause a check engine light, rough idle, decrease in fuel mileage, and poor running conditions. The fuel injected Mustang uses a small motor/valve assembly that allows a specific amount of air to enter the engine to control it's idle. 1965 Mustang 351W Idles Fine Drives Rough ??? discussion in the Tractor Talk forum at Yesterday's Tractors. An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed. Rough idle, low power on acceleration, backfire on acceleration along with black smoke, hesitation Out of the blue the 75 FJ40 started this behavior after starting it up two days ago. The fuel pressure regulator helps control the fuel pressure and the amount of fuel in the engine, which ensures that the fuel injectors function properly. 6L 3V AND 5. all has to do with cam positioning sensor. 0L Poor Idle Quality, Hesitation. 2005 Ford F150 XLT 5. 2005 · 100 Posts Mustang dyno. For you GM owners, I've had a 95 Saturn SL, and I currently drive a 95 Chevy Blazer. It seems like a long and complicated list doesn't it? Well, don't worry one of the most important things you need to successfully diagnose the misfire or rough idle on your 2. Brenspeed Detroit Rocker Naturally Aspirated Mustang GT 2005-10 F-150 2004-10 4. 6L 3V V8 engine and the TR3650 manual transmission built before 02/21/2005 may exhibit an intermittent raspy grinding noise while driving in 2nd and/or 3rd gear during acceleration. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. Again, start the engine and compare how it is running at a stop to how it normally runs. (Rough idle tends to happen when idle drops to 500 RMP. Hey hows everybody doing, I have a 2005 Dodge Ram 1500 with the 5. The car amazingly has 190K on it and is still plenty strong. you even notice the RPM's go down. 0L Poor Idle Quality, Hesitation. I think that is what I am going through right now, my idle is 650 and I think I'm going to raise it to 700 to start then go from there. the selling price of my mustang would be 8k. the low idle and hard to start etc sounded like my car had, I replaced the Fuel pressure regulator, vaccum lines, and fuel filter, no luck It happened because I turned the timing up from 8* adv to 12* without a tune on a Heads cam intake, header car, after wasting alot of time i took it and got it tuned with Delta Force Sniper tune on a dyno, all problems solved. Input please when u have bigger injectors u dont want to lower the fuel pressurewith the 24's u should be around 44 psidid it just start to do this or did u change something and then it changed is the maf calibrated for the 24's? the tps voltage should be around. For this reason we have come up with a Troubleshooting Guide to help you out. Maybe I was wrong about the outside temperature effecting the truck. 0L V6 Standard Motor Products. It starts right back up, but will. After picking up the car, though, we noticed that the idle seemed much rougher than it had in the past. I just remote start it and let it drop off high idle for now lol. It began as a hard starting issue where you would turn the key and it would crank for an extended period of time, it wouldn't catch unless you hit the gas pedal and then it would fire right up. 2005-2014 S197 Mustang Owners has 6,405 members. On a Bentley Help; 2004 Phaeton V8, 2005 Mustang GT (sold), 1997 Volvo 850 GLT, 1988 Bentley Mulsanne S. Top 10 Causes of a Rough Idle | JL Motorworks. The symptoms were the car was running oddly rough at idle, and it started to shake, but would drive just fine. In many instances, stalling ends up being an idle control motor at its limit or a failed motor. go buy a can of crc mass air cleaner from autozone and clean the maf element. When at idle, it seems like as if the car wants to die. Slide or tap the high idle stop to the right until it is against the engine control lever. 6L (excludes GT 500 and Warranty Coverage convertibles) may exhibit a “loose lumber”, rattle, or IMPORTANT: Warranty chuckle sound from the front end over bumps and coverage limits/policies are rough roads. With our stage 2 street/strip camshaft, BBR heads, BBR. Ok here it is: I have a 2005 rs. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. I've got about 750 miles on my GTO and have noticed a rough idle. 00 trade in on a Mustang GT, but I could't let it go. If I rev it up it stops until I stop again of go into an idle. If you do not allow the engine to relearn its idle trim, the idle quality of your vehicle may be adversely affected until the idle trim is eventually relearned. 3) Then, you tried to restarted the motor, it cranked, sputtered to life, idles really rough as if it had a super lopey cam but in fact it was probably struggling at 300-400RPM 4) You notice smoke out the tailpipe, the engine sounds like something is wrong. Mustang owners worldwide will welcome the new-world V-6 engine for the Ford Mustang. While there are a variety of reasons your Ford Mustang has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. Chevy Cobalt. However, the most likely causes come from the basic operating components that control fuel and ignition. Turn off the engine. I have a 2005 Mustang GT here Built very nice looking car. 6 car - Ford 2006 Mustang question. As always, consult the owner's manual or shop guide for your make and model, if you can't find the screws. Now it loads up it idles rough and the check engine light is on. I think your 88 mustang contols the fuel air mix with a manifold absolute pressure sensor. Six problems related to car stall have been reported for the 2005 Ford Mustang. If there are Ford Mustang or Ford Taurus idle air control valve symptoms, you may opt to clean the valve if it is not damaged. I would check it out;the part is about $35 and is easiloy replaceable. To test the problem, the driver presses down on the gas peddle. up it has a very rough idle, and it is worse when in gear with your foot on the brake. 6 car - Ford 2006 Mustang question. You'll notice one or more of the following symptoms. Reconnect your battery's negative terminal. 2005 F150/5. To Decrease the High Idle RPM Refer to the above steps 1, 2, and 3. Low pricing and fast free shipping on Comp Cams SPR Camshafts for the 2005-2010 Mustang GT. it will act up for a little while then it quits and goes back to running normal. The last month has been in the high 20s low 30s the whole time the truck was acting odd. See 2005 Ford Mustang technical service bulletins (TSBs) at TrueDelta, organized by model year and problem area. 2005 Ford Mustang rough idle. Not to mention my gas mileage has suffered terribly i'm getting 40-60 miles per tank less then normal sense these symptoms. So I get it replaced, put the new one on and it drives REALLY smooth but the idle was really bad. When the battery is disconnected, a new battery installed or a tune is loaded, the engine must relearn its idle and fuel trim strategy for optimum driveability and performance. 2005 Lincoln Aviator. Drive your Ford Mustang gt to complete the relearning process. Start the engine, and set the idle to the rpm you want with the stop screw on the bottom of the throttle body. It just runs really rough causing vibration but it smooths out if I put it in neutral. The idle air control motor (IAC) controls changes in idle caused by engine load. Part of FHP’s Retro Fleet, 1993 Mustang LX packs a 5. 1965 Mustang 351W Idles Fine Drives Rough ??? discussion in the Tractor Talk forum at Yesterday's Tractors. corrective action: dealers will install a shield over the cutout in the carpet behind the accelerator pedal. It began as a hard starting issue where you would turn the key and it would crank for an extended period of time, it wouldn't catch unless you hit the gas pedal and then it would fire right up. A class-action suit against Ford has been filed on behalf of consumers from 14 states, including Michigan, who claim defects have resulted in. com features Mustang news, history, photos, forums, classifieds and more. this could interfere with the pedal's ability to return to an idle position. check the harness that the 02 sensors plug into. Stalls when warm, rough idle. Top 10 Causes of a Rough Idle | JL Motorworks. It began as a hard starting issue where you would turn the key and it would crank for an extended period of time, it wouldn't catch unless you hit the gas pedal and then it would fire right up. When it shakes the check engine light will flash rapidly then stop. Engine Stalls, Misfire Code, & Cylinder Misfire The engine may be stalling because it isn’t getting enough throttle opening. You may have a misfire, a vacuum leak, or a clogged/faulty idle air control valve. Average failure mileage is 43,100 miles. Most of the time, hardware problems resulting in a rough idle will go back to the valvetrain: the camshaft or shafts, timing belt or chain, the rocker arms and lifters, or the valves, valvesprings or retainers. Also, when cold, the engine starts easily, but when warmed up, it's hard to start or it won't start. List of corrective measures please, STI Rough idle Factory 2. Ford says there is nothing wrong (no harm to the vehicle just annoying) and that they are aware of a rough idle problem and it is more prevelent the longer the wheel base. Some are related to intake manifold, some are to the vacuum line system, most the one connected to the PCV Valve. After that the car ran rough at idle and would stall occasionally. It will rev up at idle, but if in gear the smallest need for power (like trying to mount a 3 inch brick bump) will kill the engine. Car still starts and idles rough until I rev the RPM's up high. The others are just cheap plastic copies or heavy heat sinking aluminum castings. To learn more, see reviews. To test the problem, the driver presses down on the gas peddle. Sold by garage4repair on Tradebit The world's largest download marketplace 2,893,294 satisfied buyers. When it comes to your Ford Ranger, you want parts and products from only trusted brands. Dedicated to Ford Mustang enthusiasts, Shnack. Better performance, better fuel mileage, smoother idle. official recall for 1998 ford mustang recall for vehicle speed control problem. the selling price of my mustang would be 8k. 2005 Ford Mustang GT Redfire for sale: 145900km, well looked after car. 4L V8 *Brenspeed Favorite* - Update 10/02/2019: All cams are on National backorder. Not only that, but quite a few things can cause a misfire condition (or misfire trouble codes). Just this morning started to shake real bad off and on while driving. Any ideas? Do I try a. I reconnected it ten minutes later when I was done and tried to start my car and it died. Okay guys, so I'll cut right to the chase. not altered by a TSB. I have a 2009 Mustang GT and recently my engine has been idling very rough. Hope I can get to get some help with a problem I've been trying to work through for a couple months now. Be sure that your carburetor's pilot jet is the correct size and that the idle air mixture screw is correctly adjusted before looking for other causes of popping. DESCRIPTION: SOHC-Hot street cam, 3. Ive seen were the vacume line going into one has worked loose or broken cousing rough idle and throttle. Now it loads up it idles rough and the check engine light is on. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. Anything higher than the crankshaft itself is a likely culprit, but that doesn't mean the bearings or crankshaft itself aren't. Hi everyone, am having problem with my 4unner and was wondering if anyone can help. The Mustang was completely rebuilt for 2005 from the ground up, along with the new chassis, was a new look. I have encountered a rough idle condition on just about every vehicle from a Ford F150 or a Jeep Cherokee all of the way to a Geo metro. Sold by garage4repair on Tradebit The world's largest download marketplace 2,893,294 satisfied buyers. Ever since I bought my 89 5. We here at Auto Parts Warehouse want to make sure you're happy with your car part purchases. ] [This message has been edited by mnballard (edited 09-29-2005). A normal healthy idle air control valve will provide smooth idling in your vehicle. went through all cylinders and pulled cop out and found a cylinder that would have no affect of idle with me pulling it out completly which is #1 cylinder. 6L Modular 3 Valve Engines deliver an aggressive "thumping" exhaust idle and generous power gains in the middle & upper rpm range. 6L Tech > Is your mustang stumbling, dieing at idle or idling rough? 3 Likes Top. It will rev up at idle, but if in gear the smallest need for power (like trying to mount a 3 inch brick bump) will kill the engine. Tends to go away after a really hard acceleration. I used to think it was worse when - Answered by a verified Ford Mechanic. I have a 2005 mustang gt mods to the car are predator diablo sport tuner c and l cold air intake and borla exhaust with off-road x pipe I purchased the car a month ago and with the ac on the car has stalled when coming to a stop after pushing the clutch in the idles will drop low come up then stall doesnt happen every time but still happens. The vibration can be felt through the steering wheel especially when stopped in gear. Ford TSB Article # 05-15-2 Issue. the toyota service department has performed the 60k mile service, which includes plugs, fuel injector cleaning and throttle body inspection. Rough Idle / Hesitation / Stalling -- Only On Hot Starts When you try to start the engine after a trip (at least 20 minutes?) and it's really hot out. I think that is what I am going through right now, my idle is 650 and I think I'm going to raise it to 700 to start then go from there. Diagnosing the cause of the misfire (rough idle) on a 2. 05 2005 Ford Mustang Throttle Body 4. Ford built a great car in the 2005-2010 S197 Mustang, but with a little help from COMP Cams it can sound and perform like a real "hot rod". I think it may be ignition, timing, or carburetor related. Description. I started it again and the idle was rough so i let it run for 15, then ran the a/c and such. 6L Modular 3 Valve Engines deliver an aggressive "thumping" exhaust idle and generous power gains in the middle & upper rpm range. It has had one coil replaced and Runs well with the exception of a rough idle every once in a while. If you do not allow the engine to relearn its idle trim, the idle quality of your vehicle may be adversely affected until the idle trim is eventually relearned. How to Properly Set You Mustang's Idle. When the battery is disconnected, a new battery installed or a tune is loaded, the engine must relearn its idle and fuel trim strategy for optimum driveability and performance. The engine is stock with the original 2100 carb. Application. Finding the problem can be daunting, especially with so many sensors and switching valves involved. Runs great but after it heats up and I stop at a light it starts to diesel and make all kinds of noise. To learn more, see reviews. Here is a top shot, you can see the 7 top bolt. Its free to use too!!. Ford says there is nothing wrong (no harm to the vehicle just annoying) and that they are aware of a rough idle problem and it is more prevelent the longer the wheel base. 2005 Lincoln Aviator. I would check it out;the part is about $35 and is easiloy replaceable. Ok guys, and gals. 0L Poor Idle Quality, Hesitation. Every once in a while it will bog down, rough idle, and stall most of the time. llso check that the idle air control valve isn't plugged up with soot. the recall began on april 26, 2006. 2005+ Mustang GT 4. It also does not idle as smooth as it used to. Comp Cams has released the 3V modular engine line of rough idle camshafts. Stalls when warm, rough idle. went through all cylinders and pulled cop out and found a cylinder that would have no affect of idle with me pulling it out completly which is #1 cylinder. Every once in a while it will bog down, rough idle, and stall most of the time. The 2005 Ford Focus has 2 problems reported for rough idle. if i do push the gas down it hesitates then bogs down and is slow to accelerate. I notice it when I stop at red lights. If the transmission has always done this you may be able correct it with our valve body kit alone, or maybe the valve body kit and the A+ Overdrive servo. I have a 1993 Mustang GT the transmission works fine except it seems to struggle a little bit to get from 3rd into Overdrive is there anything I can do to fix this. it has the 6. Other than this everything seems to be running very smoothly. I started it again and the idle was rough so i let it run for 15, then ran the a/c and such. A class-action suit against Ford has been filed on behalf of consumers from 14 states, including Michigan, who claim defects have resulted in. I have a really rough/missfiring idle, it seems to go away over 1500 RPM, but the car idles terribly at startup and gets no better when it is up to temp, it is bad enough to cause it to occasionally stall. Ive seen were the vacume line going into one has worked loose or broken cousing rough idle and throttle. Rough idle? Ill stop at a light and it will idle fine but after a few seconds it dips in rpms and idles rough for a second or two. if you PB Blast it or some WD40 and scrape off the carbon it may fix your problem. 34% of the time it's. Diagnosing the cause of the misfire (rough idle) on a 2. When I start the truck the engine runs smooth when in either Park or Neutral but when in Drive the idle becomes rough and verges on stalling. Hey I have a 2000 prerunner v6. step on the break and idle in first for a couple of seconds then shift up into. Chevy Cobalt. Just a quick question. Today you can still net yourself a decent one for under $5,000, but chances are it needs some help. You need to see in person to appreciate No winters, has only seen rain on a rare occasion This car has been babied since I have owned it - June 2016 Car is covered in the winter and all maintenance up to date Newer brakes 2 years ago and oil changed has about 1200km left to go. At 50k checked again and leak in worse and took back to dealership (jones Ford, n. It will have a really rough idle, the car will shake / vibrate and the throttle response is horrible, it sounds like its bogging out, and sometimes even stall. The rough idle only happens in very warm days after the car being driven for some time. When an IAC motor starts to malfunction, it can cause a check engine light, rough idle, decrease in fuel mileage, and poor running conditions. 9v at closed throttle did u check. If your 2001 Mustang V6 throttle body is dirty you will notice your car has a rough idle. If I got it over 1500 rpm it would run fine but when idle drops. Not only that, but quite a few things can cause a misfire condition (or misfire trouble codes). Brenspeed Detroit Rocker Naturally Aspirated Mustang GT 2005-10 F-150 2004-10 4. Put gear shifter in "P" (Park), turn off all accessories. and also my fuel milage as decreased a little from 30mpg to about 25mpg its taking a lot more gas to get it motivated [This message has been edited by mnballard (edited 09-29-2005). this could interfere with the pedal's ability to return to an idle position. The driver of the vehicle may be unaware of this problem, until the battery power is lost. Found this thread, got the OVP relay locally within 12 hours, and I back on the road. This occurred only once but was followed in two subsequent events with the check engine light coming on and the (yellow wrench light) for the throttle control. 2005 ford mustang rough idle was created by stwarrior23 So im new to this forum, but have been to plenty of mustang forums with this problem. When in gear, there's a thump-thump-thump noise, and it seems like the engine is Rough idle, shaking vehicle, NO CODES!. 2010 Mustang V-6 Cold Air Intake. 5 Volts DC) whenever you apply vacuum with the vacuum pump (and of course the engine will idle rough). 2005 F150/5. Idle Relearn Because your vehicle's engine is electronically controlled by a computer, some control conditions are maintained by power from the battery. Run the engine until it reaches normal operating temperature. If I got it over 1500 rpm it would run fine but when idle drops. so i have a 2005 ford mustang v6 automatic transmission with 95k on it in florida, united states of america. Your Ford Mustang was built to be impressive in both style and performance. rough idle, engine dies - When i start my car it idles rough and then dies. Genuine Ford Part. This covers year models 1986-1993, and 1994-1995. When a vehicle begins to idle rough or stall, the idle system requires service. Leaving work today after car had been sitting for 7 hours, I started it and pulled up to the light, about a couple hundred feet away from my parking space. So far as the rough idle goes, (I cant say about the speedo) I'm going to hazard a guess you have a problem with the Idle Air Control Valve or some call it Idle Air Motor. Hope I can get to get some help with a problem I've been trying to work through for a couple months now. So I get it replaced, put the new one on and it drives REALLY smooth but the idle was really bad. The idle air control motor (IAC) controls changes in idle caused by engine load. I did an archive search for "antilock idle" and bam. I started it again and the idle was rough so i let it run for 15, then ran the a/c and such. I am guessing rubber motor mount bushings are stiff when cold and soften by heat under the hood. " Makes since, low charge output, computer idles up engine to speed up alt. Your Ford Mustang was built to be impressive in both style and performance. When I start the truck the engine runs smooth when in either Park or Neutral but when in Drive the idle becomes rough and verges on stalling. 2005 Ford F150 Eng Codes P0022 and P0342 erratic running I have a 2005 Ford F150 5. How To Tell If A Vehicle Is Idling Rough. I started it again and the idle was rough so i let it run for 15, then ran the a/c and such. Genuine Ford Part. Occassionally, the car will stall out when stopped at a traffic light for an extended period. The vehicle initially threw a DTC P0507 ("Idle Air Control System. I would check it out;the part is about $35 and is easiloy replaceable. Sold by garage4repair on Tradebit The world's largest download marketplace 2,893,294 satisfied buyers. In many instances, stalling ends up being an idle control motor at its limit or a failed motor. ES3461, EV421, K8695T, and K72775 suspension parts by Detroit Axle are designed for 2002 to 2005 Ford Explorer vehicles and 2002 to 2005 Mercury Mountaineer cars. You need to see in person to appreciate No winters, has only seen rain on a rare occasion This car has been babied since I have owned it - June 2016 Car is covered in the winter and all maintenance up to date Newer brakes 2 years ago and oil changed has about 1200km left to go. My S10's idle has always been roughnot irregular like it's missingjust rough enough to vibrate the steering wheel pretty good when it's warmed up. so figured it was a leak somewhere else. Ok I have a question. 4 Triton Idle Adjust the other day so i'm putting some miles on first to see if that clears the rough idle. 6 Automatic with 264K miles - Car has intermittent rough idle - New plugs, new wires, no codes, no vacuum leaks. Definitely noticeable if I put it into gear right away. And by random I mean maybe every other day or so. Some 2005 Mustang vehicles equipped with the 4. new spark plugs on my old 2005. Replaced TPS and now the car won't start. Compression. Drive your Ford Mustang gt to complete the relearning process. Idle problems may originate in a worn out component, a. My cousin has an 05 v6 mustang that randomly the idle will jump up to 1500 rpm. Spoke with the guys at Granatelli and they sent me the c-plus model. ] ddenton749. new spark plugs on my old 2005. 4L 3V FORD: LINCOLN: 2005 Mustang 2005 Navigator 2004-2005 F-150 2005 Expedition, F-250, F-350 This article supersedes TSB 06-4-7 to update the NOTE Service Procedure. Have a 2005 Ford Mustang that was towed in because it would not accel, would cut off when trying to accel. It began as a hard starting issue where you would turn the key and it would crank for an extended period of time, it wouldn't catch unless you hit the gas pedal and then it would fire right up. the low idle and hard to start etc sounded like my car had, I replaced the Fuel pressure regulator, vaccum lines, and fuel filter, no luck It happened because I turned the timing up from 8* adv to 12* without a tune on a Heads cam intake, header car, after wasting alot of time i took it and got it tuned with Delta Force Sniper tune on a dyno, all problems solved. It can be cleaned with a choke/carburetor cleaner by spraying this compound on, and then wiping the buildup away with a rag. went through all cylinders and pulled cop out and found a cylinder that would have no affect of idle with me pulling it out completly which is #1 cylinder. Description. once the turbo catches up the power comes back. While there are a variety of reasons your Ford Mustang has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. My 94 Mustang 5. if i do push the gas down it hesitates then bogs down and is slow to accelerate. My cousin has an 05 v6 mustang that randomly the idle will jump up to 1500 rpm. Average failure mileage is 43,100 miles. fixed that and it helped but didnt eleminate problem. I have a 99 4. Dedicated to Ford Mustang enthusiasts, Shnack. This valve is comonly called the idle motor, the IAC (idle air control) or the IAB (Idle air bypass). That lasted a few weeks then disappeared into just a very rough idle with very rough acceleration on the low end mostly. Precision-machined to ensure accurate variable valve timing, correct rough idle, and restore drivability; Designed to match OE performance in restoring and maximizing horsepower and torque curves. My 2005 Honda Accord I4 is idling fine when cold but once warm it begins "revving" on its own between 1200-2000RPM at about 0. when it starts to idle rough I have to go tighten the filter back up, or wait a couple more miles for it to get bad, then go put the. We can’t tell if it’s also rough during driving, or when the car is in park or neutral, but there is definitely considerably more vibration when the car is stopped in drive and idling–you can feel it throughout the car. Starts for 2 - Answered by a verified Ford Mechanic. The engine is stock with the original 2100 carb.